Nakashima Yusuke, Sugita Yoichi
Department of Psychology, Waseda University, Tokyo, Japan.
J Vis. 2018 Mar 1;18(3):16. doi: 10.1167/18.3.16.
The present study examined whether the Ebbinghaus illusion can be induced by surrounding contexts that are suppressed from conscious perception. We employed continuous flash suppression to render the contextual stimuli invisible. The surrounding contexts were presented to one eye and the masking stimulus was presented to the other eye, followed by the presentation of the two center test stimuli to both eyes. The illusory size effect was observed even when the inducers were rendered invisible, although the effect was weak-approximately one third the strength of that induced by visible contexts. The effects induced by both visible and invisible contexts decayed with equal speed as the interstimulus interval between the inducer and test stimuli increased. Moreover, interocular transfer of illusory size effect did not occur when the inducers were suppressed from awareness. These results suggest that the size-contrast effect in the Ebbinghaus illusion is mediated in V1, and the monocular pathway in V1 is involved in the unconscious effect.
本研究考察了艾宾浩斯错觉是否可由被意识知觉抑制的周围情境所诱发。我们采用连续闪光抑制使情境刺激变得不可见。将周围情境呈现给一只眼睛，而将掩蔽刺激呈现给另一只眼睛，随后向双眼呈现两个中央测试刺激。即使诱导刺激变得不可见，仍观察到了错觉大小效应，尽管该效应较弱——大约只有可见情境所诱发效应强度的三分之一。随着诱导刺激与测试刺激之间的刺激间隔增加，可见和不可见情境所诱发的效应均以相同速度衰减。此外，当诱导刺激被意识抑制时，错觉大小效应并未发生双眼间转移。这些结果表明，艾宾浩斯错觉中的大小对比效应在V1区介导，且V1区的单眼通路参与了无意识效应。
